sixate: like gad said, some animals do not have the physical capability to do an act (ie, no thumbs) so you cannot say that they are to dumb to do it.
i doubt they could do surgery, myself, but i do not have the ego to say
i know exactly!
on examples of intelligence. off the top of my head
1) an orangetan (sp) would always find a way to escape his housing at a zoo. he learned to steal any kind of tool and hide it in his mouth.
later on, when the zoo is all buy shut down, he would go unlock his door, then unlock all of the other doors.. then go back to his cage and play innocent
ravens/crows have learned how to use traffic in Asia to crack a certain nut they like to eat but are impossible to crack.
they drop their nut in a line of vehicular traffic. they wait until a car cracks it, then they watch the stop lights. when it is the color for traffic to stop they fly down and feast. when the color for 'go' comes back on, the bird flies away.
3) Dolphines (I forget where) have been hunting with people for awhile now. the chase fish and mullet up into the men's nets and gives the men signals to pull in..... the dolphines have an easier chance at catching some while helpiing humans out at the same time.
4) Alex, an African Grey (a great parrot) can now read. no, i did not say copy or mock... he can
read
that's enough examples for now.